In the most ancient form of this divination a spearhead was spun in the sand. Several centuries later, during the Early Middle Ages, divinations with pins became popular in Europe. Readers used seven pins and a table covered with cloth. Pins were thrown over the table, and the patterns were read and interpreted.

According to the article in wikipedia, what follows are the basic patterns and their interpretations:

1 – Love

5 – Danger

9 – Honesty

13 – Sickness

17 – Pleasure

21 – Break-up

2 – Money

6 – Quarrel

10 – Rudeness

14 – Wedding

18 – Encounter

22 – Health

3 – Gift

7 – Prison

11 – Joy

15 – Birth

19 – Meeting

23 – Vanity

4 – Grief

8 – Engagement

12 – Letter

16 – Resistance

20 – Success

24 – Road

I am not clear as to what those particular numbers refer to, and so far my research has yielded no results. I do, however, believe that any magickal square, or any other “map” could be used, as long as you are clear as to what the various areas on the map mean to you. For example, you could use a Feng Sui square to drop your pins on, and then interpret the meanings based on where and they land.